uniform identification, possibly French

uniform identification, possibly French

Can anybody help me identify this uniform,sorry for bad picture quality.I knownothing about the picture but hope the uniform may give me clues.I have a feeling this may be my french great great grndfather and English great great grandmother but i am unsure as i have never seen their photos before.Any info at all evena possible date woud be so helpful.Thankyou in advanceKatie